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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68d246fb517d8c4de485e47b64dd603b54ea9317301c72ed63ae179372bce17c' 
  AND token = '9VVrLkbcjLycOuPx0erOGe1Zr4gk8nNdMUx4WAEgTGk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}